摘要
采用Levins公式和王刚生态位计测方法,分析了奇台荒漠草地自然保护区16种植物在土壤pH值,土壤总盐含量和土壤有机质维上的生态位宽度和生态位重叠.结果表明,按照各资源维上生态位宽度的平均值大小可以把16种植物分成3类,第一类群的物种是该荒漠区植物群落中的建群种,对荒漠环境有很好的适应性,包括白梭梭(0.421)、沙拐枣(0.458)、角果藜(0.641)、琵琶柴(0.569)等;第二类群的物种对环境的适应能力较弱,物种有沙蓬(0.326)、对节刺(0.304)、旱麦草(0.221);第三类群的对沙漠的适应能力较弱,生态位平均值均小于0.2,包括盐穗木、梭梭、猪毛菜、假木贼和驼绒藜。优势种的生态位宽度越大相应的生态位重叠值也越大,存在一定的线性关系,表明优势种在对荒漠的环境适应上都趋于相似性。
The niche differentiation of 16 main species in Qitai desert grass nature reserve was analyzed quantita tively with respect to community gradients and single ecological factor gradients,i, e. soil salinity soil acidity and soil organic matter by Levins formula and the method by Wang gang. The results showed that the 16 species could be divided into three groups, based on their average niche breadths. Group one includes Haloxylon persi cure （0. 421 ） , Calligonum mongolicun （0. 458 ） , Ceratocarpus arenarius （0. 640 ）, Reaumuria soongorica （0. 569）, which are constructive species in Qitai Nature reserve and their niche breadths are greater. Group two in cludes AgriophyUum squarrosum （0.326）, Horaninowia ulicina （0. 304）, Eremopyrum triticeum （0.221） ; and their niche breadths are smaller than that of group one. Group three includes Halostachys caspica, Haloxylon am modendron, Salsola sp, Anabasis sp, Ceratoides, and they have less ability to adapt to the desert. The results showed that larger the dominant species niche breadth is, the greater the corresponding niche overlap is. It indi cates that the dominant species in the desert environment have tended to adaot the similarity.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2012年第9期57-61,共5页
Journal of Arid Land Resources and Environment
基金
校级优秀青年教师启动基金项目(XJNU0924)
校级重点实验室开放基金项目(XJNUKL0302)资助
